Shock-absorbing support for pneumatic hammers.



R. A. NORLING.

snocx Ansonnme SUPPORT FOR PNEUMATIC HAMMEBS.

APPLICATION FILED MAR. 24, 1911.

Patented Nov. 5,1912.

r NT orio.

REINHOLD A. NORIIING, OF AURORA, ILLINOIS, ASSIGNOR TO AURORA AUTOMATIC MACHINERY COMPANY, OF AURORA, ILLINOIS, A CORPORATION OF ILLINOIS.

SHOCK-ABSOBBINGJSUPPORT FOR PNEUMATIC HAMMERS.

To all whom it may concern:

Be it known that I, REINHOLD A. Nonnmo, a citizen of the United States, and a resident of Aurora, in the county of Kane and State of Illinois, have invented certain new and useful Improvements, in Shock-Absorbln Supports for Pneumatic Hammers; and

do hereby declare that the following is a.

brace a pneumatic cushionmember secured to the head of the hammer and adapted to hold the hammer in proper position during its operation, and at the same time to provide an air cushion for the absorption of the rearward jars or kicks due to the reaction of the blows delivered by the hammer.

The invention relates more particularly to certain novel features of construction whereby the strength and eiiiciency of the support are greatly increased and consist of the matters hereinafter described and more particularly pointed out ,in the appended claims.

In the drawingsFigure 1 is a view representing a' longitudinal central section through the support and a part of the pneumatic hammer to which it is attached; Fig. 2 is a view representing a transverse section through the forward end of the support on the line 2-2 of Fig. 1; Fig. 3 is a view representing a'section in a lane indicated by the line 33 of Fig. 2, sald section being on an enlarged scale; Figs. 4 and 5 are views representing difierent transverse sections through the barrel in planes indicated respectively by the lines 44 and 55 of Fig.

1. Fig. 6 is a view representing a side elevation of the rear member of the plunger showing an extension supporting device with a form of head different from that shown in Fi 1.

1511 the drawings, 10 indicates the hammer, 11, the head of the hammer and 12, the shock absorbing support as a whole. 12 is the barrel of said support in which is recipro- Specification of Letters Patent.

Application flled March 24, 1911. Serial No. 616,725.

Patented Nov. 5, 1912.

cably mounted a piston rod 13 and a piston 14. The barrel 12 is preferably made integral with the hammer head 11. In said head is located the familiar throttlevalve 11 which controls the supply of air to the hammer, said valve being supplied with air through a passage or opening 11 in the end wall 12 'of the barrel of the support. The barrel 12 is provided near its rear end with a laterally extending, apertured boss 15, into which is screwed a nipple 16 which provides means for the attachment of a hose or pipe leading from a source of compressed air supply (not shown) and containing the usual hand-controlled valve by means of which live air is admitted into the barrel 12*.

The piston rod 13 projects beyond the rear end of the barrel which is closed by means of a reducing cap 17 having a central aper ture in which said piston rod has bearing. The piston rod is made in two parts and comprises a forward member 13 made rigid with the piston-head 14 and a rear end member 13*, which is rotatively connected to the.

first-named member. As shown herein, the piston rod member 13 has a longitudinal central bore 18 which provides a bearing for the reduced forward end 18 of the member 13*. Convex disks 20, 20 are interposed between the forward end of the member 13 and the end wall 21 of said bore to provide an antifriction thrust bearing between the two parts of the piston rod. 1

22, 23 indicate adjacent flanges formed respectively on the piston rod members 13" and 13 and 24 is an elastic clip made of spring metal and having flanges 24?, 242 which engage the flanges 22 and 23 respectively on oppositesides and hold the two parts of the piston rod members together.

To the 'rear end of the piston rod member 13 is secured a movable head 25. Said head may have either a point 25*, as shown in Fig. 1, adapted to engage in a hole or opening in line with the rivet or bolt that is being operat d upon by the hammer or a recess 25", as sho in Fig. 6, adapted to engage the head of a rivet or bolt in line therewith,

the rear end of the support in alinement with the work.

f Referring now to the packing for the piston: 26, indicates a forwardly-projecting. centrally located, threaded stem made rigid shaped packing member made of leather or other suitable material having the base 27 of the cup bearing against the front face of the piston head and its side walls engaged a ainst the inner surface of the barrel 12. 1%16 base of said cup has a centralaperture through which the stem 26 pro ects. A metallic cup 28 fits withm the leather cup 27 and acts to hold the said leather cup in proper engagement with the inner surface of the barrel. has a centrally located aperture through which the stem 26 extends and said base is held in clamping engagement against the base of the leather cup by means of a nut 29 between which and the base of said metal cup is interposed a flat washer 30 against which said nut directly acts. After sa d nut is tightened against the washer 30, it 1s locked in place by means of a cotter pin 32 which extends through slots 33, 33 in the outer end of said nut and a transverse aperture 34 in the stem 26.

The base'of the leather cup 27 rests in a recess 36 formed on the front face of the piston head and formin with the inner wall of the barrel a rounde corner for the reception of the rounded edge of the cup base. This construction provides a support which prevents the flange of the cup from bending at a sharp angle to the base thereof and thus in the operation of the piston cracking or breaking the leather.

40 indicates a coiled spring interposed between the piston head and the reducing cap 17, and acting to normally hold the piston at the forward limit of its movement. Said spring acts in opposition to the pressure of the'live air entering the forward end of the barrel 12 of the support when the controlling. valve admitting live air to said barrel is opened.

As shown in the drawings, the reducing cap is secured to the rear end of the barrel of the support as follows: Said reducing cap comprises an apertured plate 17 which engages against the rear end of the barrel 12; an outer, internally threaded flange 17 embracing the end of said barrel and engaged with a thread formed thereon; and a centrally disposed flange 17 within which the piston 13 has bearing. The plate 17 and the larger flange 17 b are split to provide a longitudinally extending recess .5 at each side of which are formed ears 46, 4:7. Said ears are provided with transverse apertures inwhich is located a clamping bolt 48. 49 indicates a nut screwed uponthe threaded end of said .bolt and said nut has a conical base 49 fitting within a conical .recess 50 in the outer face of the ear 47. The threaded end of thebolt has flattened sides 48 and after the nut has been screwed home into the said recess the thread of the nut near its The base 28 of said metal cup action of the spring 40 until the head 25 is brought into supporting engagement with a hole or rivet-head over against the rivet or bolt that isto be operated upon by the hammer. The live airin the barrel acts as a pneumatic cushion toabsorb the successive shocks due to the reactions of the hammer.

By rason of the rotative connection of the two piston members, the hammer maybe rotated without rotating the supporting head which is rigidly engaged against the hole or rivet-head which supports it.

I claim as my inventionv 1. A shock absorbing support for a hammer embracing av cylinder, a piston and piston rod reciprocally mounted in said cylinder, means for supplying live air at the forward end of said cylinder to act upon said piston, and yielding means adapted for normally holding said piston at its forward limit of movement, saidpiston rod projecting beyond the rear end of said cylinder and comprisin made rigi with the piston head and'being provided at its rear endwith-a longitudinal, central bore, and the other part having a reduced end rotatively mounted within said bore, means for locking saidparts against longitudinal separation, and anti-friction end thrust devices located in said bore and engaged by the reduced end of said secondnamed piston rod member.

2. A shock absorbing support for a hammer embracing a cylinder, a piston and piston rod reciprocally mounted in said cylinder, means for su plying live air' at the forward end of sai cylinder to act upon said piston, and yielding means adapted for normally holding said piston at its forward limit of movement, said piston rod projecttwo parts, the one part being.

ing beyond the rear end of said cylinder and comprisin two parts; the one made rigi part being with the head and eing provided at its rearend with a longitudinal,

duced end of said second-named piston rod member, I Y

3. A shock absorbing support for a pneumatic hammer embracing a cylinder extending rearwardly from the head of said hammer in line therewith, a piston rod and piston reciprocablymounted in said cylinder and a reducing cap rigidly secured to the rear end of said cylinder, and having an aperture providing-a bearing for said piston rod, means for rigidly securing said cap to said cylinder embracing an internally threaded split flange adapted to embrace the end of said cylinder, the end of said cylinder having a thread which is engaged by the thread of said flange, laterally extending ears or lugs at each side of the split in said cap,

said lugs being provided with transverse apertures, a bolt located in said apertures having a head engaged against the outer face of one of said ears, a nut threaded upon the other end of said bolt and engaging the outer face ofthe other ear, said nut being provided with a conical base engaging-within a conical recess within the adjacent face of the associated ear, and the threaded end of said bolt having flattened sides against which the thread of the nut is swaged to lock the same in position.

In testimony, that I, claim the foregoing,

as my invention I aflix my signature in the presence of two witnesses, this 16th day of March, A. D. 1911.

REINHOLD A. NORLING.

Witnesses:

OSCAR CARLGREN? LESTER J. YOUNG. 

